Chuck.



Patented Sept. 9, |902. C. H. REID.

CHUCK.

(Application filed Dec. 7', 1901.)

CNO. 708,735.

2 Sheets-@Sheet I.

(N0 Model.)

Suva/:Mofo

No. 708,735. Patented Sept. 9, |902.

c. H. REID.

cHucK.

(Application led Dec. '7, 1901.)

(No Model.) 2 Sheets-Sheet 2.

UNTTJED STATES PATENT Crrrcn.

CHARLES II. REID, 0F DANBURY, CONNECTICUT.

CHUCK.

SPECIFICATION orming part of Letters Patent No. 708,735, dated September 9, 1902. Application ilecl December 7, 1901. Serial No. 85,036. (No model.)

To cr/ZZ whom it may concern.:

Be it known that I, CHARLES'H. REID, a citizen of the United States, residing at Danbury, in the county of Fairfield and State of Connecticut, have invented new' anduseful Im-I provements in Chucks, of which the following is a specification.

My invention relates to chucks, and is designed more particularly as an improvement upon the chuck disclosed in myReissue Letters Pat-ent No. 10,766, ofr September 2l, 1886. The said chuck is made up of a frame or head, slidable jaws arranged in suitable bearings therein and having oppositely disposed threads at their sides, and a screw having right and left handed threads engaging the ders at the inner ends of the threaded por-v tions of the screw and the consequent endwise play of the screw, which would permit of movement of the jaws and work held thereby and destroy the usefulness of the chuck. The collars are, moreover, advantageous when work is being done, such as turning or cutting off, since there is considerable longif tudinal thrust on the screw every time the jaws come into alinementwith thetool,which` thrust is resisted by the collars, and they are also advantageous because they withstand the shock when work held in 'the jaws is hammered in line with the direction of movement'y of the jaws, and thereby prevent breakage of the parts of the screw which abut against the head.

The general object of` my present invention is to improve the type of chuck stated by the provision on the screw therein lofV collars of peculiar formation which are more eicient than the collars extant in preventing rapid or undue wear of the shoulders of the screw as well as breakage of said shoulders or other parts of the chuck when the screw is subjected to endwisethrust or shock.

Other advantageous features of the invention will be fully understood from the following description and claims when taken in conjunction with the annexed drawings, in which- Figure l is a side elevation of my improved chuck; Fig. 2, aplan; Fig. 3, a section taken in the plane indicated by the line 3 3 of Fig. l, with the screw in plan; Fig. 4, a vertical `section through the frame or head with the jaws and screw removed; Fig. 5, an enlarged perspective view of one jaw removed; Fig. 6, a similar View of the other jaw; and Figs. 7 and 8, sections similar to Fig. 3, but illustrating modified forms of collars on the screw.

Referring by letter to the drawings, and more particularly to Figs. l to 6 thereof, A is the chuck head or frame, recessed and having suitable bearings a for the jaws. B B are the jaws, and C is the improved screw, arranged in the frame alongside they path of the jaws. The jaws B Bare provided at their sides with opposite screw-threads b b andare inserted in the head or frame with their ythreads in engagement with the threads of the screw C, which latte threads are right and left handed, as shown, in order to draw lthe jaws together or spread them apart, according to the direction in which the screw is turned. In addition to the said right and left hand threads the screw has shouldersc, arranged to abut against the head or frame A, as best shown in Fig. 3, and two collars D,

vdisposed between the said shoulders and the middle 0f the screw-shank. These collars D, which constitute the gist of the present invention,are in the form of cones, disposed as shown with respect to the threads and shoulders of the screw and provided with steps CZ, and they are snugly arranged in correspondingly-stepped recesses e in the chuck head or frame. By virtue of this it will be observed that the said collars are divided into pluralities ot' sections, the face and perimeter of each engaging the chuck head or frame at a different point-z'. e., a different distance from the middle of the screw-shank. It will also be observed that being tapered or gradually reduced in diameter toward their outer IOO ends or in the direction in which strain, thrust, and shock are imposed on the screw when the chuck is in use the collars D are much less liable to be broken or injured by such strain, thrust, or shock than the collars at present in use, which have plain bearingsurfaces extending at right angles from the screw-shank to their perim eters, and, further, it will be observed that the pluralities of surface sections on the collars, each engaging the head or frame at a different point, are highly advantageous, because in the event of one or more of said surface sections tending to wearer break the others maybe depended on to hold the screw against endwise play, and thereby prolong the usefulness of the chuck. This latter advantage will be appreciated when it is remembered that the portions of the head A presented to the several steps of the collars may be dierent in character-z`- e., one portion may be softer than the others or may contain a iiaw not common to such others. The stepped collars as compared with those having plain bearing-snrfaces extending at4 right angles from the screw-shank to their perimeters are also advantageous, because in the positions shown greater thicknesses of the head are afforded to resist the thrust of said collars than would be afforded to resist the thrust of plain collars in corresponding positions.

The described ability of the improved collars D to resist frictional wear, as well as strain,thrust,and shock imposed on the screw, enables them to efectually remove strain from and prevent wear of the shoulders c, and thereby prolong the usefulness of the chuck to a much greater extent than collars of the ordinary form.

Aside from the feature described the jaws B I5 may be of any suitable construction. They are placed in the recessed head or frame at'ter the screw C, and said screw is then operated until engagement of the same with the jaws is elected, when the chuck is ready for use.

Notwithstanding the advantages ot' the peculiar collars D as pointed out in the foregoing, it will be appreciated that chucks embodying the same maybe produced almost it' not quite as cheaply as the chuck disclosed in my aforesaid patent.

The modified construction shown in Fig. 7 is similar to that in Figs. l to 6, with the exception that its collars D have the peripheries of their steps CZ beveled or tapered, and the Walls of the stepped recesses e are correspondingly beveled or tapered. Such modified construction possesses all the advantages of the construction shown in Figs. l to 6 and the additional advantage that the perimeters,

as well as the outer faces ot' the steps d', form bearings to remove strain from and prevent Wear of the shoulders at the inner ends of the threaded portion of the screw.

The plain cone-shaped collars D2 embraced in the construction shown by Fig. 8 are advantageous, because, like the collars shown in Figs. l to 7, they are better able to withstand strain, thrust, and shock imposed on the screw than collars which have plain bearingsurfaces disposed at right angles to the screwshank and extending from said shank to their peripheries.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s

l. In a chuck, the combination of a frame, threaded jaws therein, and a screw arranged in the frame and having right and left handed threaded portions engaging the threads of the jaws, and shoulders c at the inner ends of said threaded portions arranged to abut against the frame, and also having collars disposed between the shoulders c; the said collars being reduced in diameter outwardly, and arranged in correspondingly-shaped recesses of and bearing against the frame.

2. In a chuck, the combination of a frame, threaded jaws therein, and a screw arranged in the frame and having right and left handed threaded portions engaging the threads of the jaws, and shoulders c at the inner ends of said threaded portions arranged to abut against the frame, and also having coneshaped collars provided with steps, at points between the shoulders e; the said collars being arranged with their reduced ends outwardly, and in correspondingly shaped and stepped recesses of the frame.

3. In a chuck, the combination of a frame, threaded jaws therein, and a screw arranged in the frame and having right and left handed threaded portions engaging the threads of the jaws, and shoulders c at the inner ends of said threaded portions arranged to abut against the frame, and also having, at points between the shoulders c, cone-shaped collars provided with steps, the perimeters of which are beveled or tapered toward the reduced ends of the collars; the said collars being arranged with their reduced ends outwardly and in correspondingly shaped and stepped recesses of the frame.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

CHARLES H. REID.

Witnesses:

EUGENE C. DEMPsEY, J oHN C. DORAN.

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